Problem: When hydrogen and oxygen combine to form water, they form:A) an unstable compoundB) a stable mixtureC) an unstable mixtureD) an extremely stable compound

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Recall that Matter can be categorized as a single or variable composition.

• Matter is considered a pure substance if it is composed of a single entity. Pure substances can be further categorized into two:

Element  cannot be separated into simpler substances or composed of only 1 type of atom (eg. O3, Cl2)
Compound  can be separated into simpler substances

• Matter is considered a mixture if they have variable composition. Mixtures are not chemically combined. Mixtures can be further categorized into two:


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Problem Details

When hydrogen and oxygen combine to form water, they form:

A) an unstable compound

B) a stable mixture

C) an unstable mixture

D) an extremely stable compound

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